Exercise 26.7. Let A = {1,2,3} and let f: A→ A be given as f = {(1,2), (2,3), (3, 1)}. 26. COMPOSITION OF FUNCTIONS (a) Determine f-¹. (b) Determine fof. (c) Determine fofof. 205
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- Consider f(t)=<3t^2,5t^3,9t^4>. Integrate f(t). Upper Limit=1 Lower Limit:0Determine two functions, defined on the interval (−∞,∞)(−∞,∞), whose Wronskian is given by W(f1,f2)=e2xW(f1,f2)=e2x. Are the functions that you found linearly independent on (−∞,∞)(−∞,∞)? How do you know?f X1,X2,...,Xn constitute a random sample of size n from a geometric population, show that Y = X1 + X2 + ···+ Xn is a sufficient estimator of the parameter θ.
- For x = 1, 2, 3 and y = 1, 2, let the joint pmf of X and Y be defined by f X,Y (x, y) = (x+y)/21 Show Cov(X, Y)Determine two functions, defined on the interval ( − ∞ , ∞ ) , whose Wronskian is given by W ( f 1 , f 2 ) = e 2 x . Are the functions that you found linearly independent on ( − ∞ , ∞ ) ? How do you know?LetX1,X2,...beindependentrandomvariablessuchthat Xj hastheuniformdistributionon[−j,j],j=1,2,....ShowthatLindeberg’sconditionissatisfied.
- Find the Wronskian for the set of functions.{x, e−x, ex}find a control u(t) for x`(t)= [2, 1 ; 1, 1] x(t) + [1; 1] u(t), x(0)= [5; 0] so that x(2) = [0; 0] . Find the u(t) that will drive the intial state to the give final stateSuppose that a consumer derives his utility from two goods, the amounts of which are x and y, according to the utility function U(x,y)=ln2x+ln5y. The consumer has income B to spend, the prices of the two goods are px and py, and B, px and py are all assumed to be exogenous. Express the income and the substitution effect in terms of good x. Is good x normal and ordinary?